Wholesale Logitech USB Unifying Receiver Logitech Unifying Receiver 6 Channel and Nano Receiver for Logitech Wireless Mouse and keyboard From m.alibaba.com
Logitech Nano Receiver for MK270 (Non-Unifying) New Ship from USA | eBay
Original] Logitech USB Unifying Receiver Pico | Lazada Singapore
As a computer guy that has picked up 10+ keyboards and mice without USB, this is an extremely helpful find : r/DumpsterDiving
Logitech Unifying receiver - Wikipedia
Logitech Unifying Receiver, 2.4 GHz Wireless | Ubuy Hong Kong